Expand tabs to spaces.

Implement 'lpwd', 'lcd', 'chmod' commands.

Implement a few common command aliases.

Implement glob expansion in some subcommands.

Import GetOptionsFromArray().
Fix rename(), chmod(), chown(), truncate(), utime() to throw away attr cache entry on success.

Pass -1 for length if l_len param is 0.

Clean up debug output for lock() op.

Get 100 entries at a time in readdir() instead of 50.